How do you hold your mouse? Tracking the compatibility effect between hand posture and stimulus size.

Area of Science:

• Cognitive Psychology
• Motor Control
• Human-Computer Interaction

Background:

• Object observation is theorized to activate potential motor responses.
• Previous research shows compatibility effects between reporting hand postures and stimulus characteristics.
• The temporal dynamics of these compatibility effects remain largely unexplored.

Purpose of the Study:

• To investigate the real-time dynamics of compatibility effects between hand postures and object characteristics.
• To examine how mouse grip (power vs. precision) interacts with object size (big vs. small) during a categorization task.
• To explore compatibility effects with different stimulus types (visual figures vs. lexical stimuli).

Main Methods:

• A categorization experiment where participants classified object figures as natural or artifact.
• Utilized a big mouse (power grip) and a small mouse (precision grip) to record responses.
• Tracked the time course of compatibility effects between mouse grip and object size, and later between grip and word category.

Main Results:

• A significant compatibility effect was observed between the mouse grip (power/precision) and the perceived object size (big/small), even when size was task-irrelevant.
• Lexical stimuli (words) did not replicate the visual figure effect directly.
• However, a compatibility effect emerged based on the target word category (artificial vs. natural).

Conclusions:

• The findings support theories of grounded cognition, suggesting that perception and action systems are tightly coupled.
• Demonstrates that task-irrelevant object properties can influence motor responses in real-time.
• Highlights the role of affordance effects and category-level processing in mediating action-perception links.